Obesity is based on the body mass index, a calculation using height and weight.

肥胖是根据身体质量指数，用身高和体重计算出来的结果。

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They also found, as other researchers have, that higher body-mass index (BMI), a calculation based on height and weight, was also linked with earlier puberty.

他们同时还发现，正如其他研究人员已经发现的那样，较高的体重指数(BMI)——一项根据身高和体重计算出的指标，同样也跟早熟有联系。

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Now I'm going to do the same calculation in the center-of-mass frame.

我们会做同样的计算,在质量重心体系中。

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Unfortunately, the recent Journal of the American Medical Association publication analyzing life expectancy correlations to one imperfect calculation of relative weight (BMI, the body mass index) distracts readers all-too-eager to cling to its implications that being chubby is actually better.

FORBES: Obesity: The New 'Just Say No' For 2013